# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: distutils\spawn.py
"""distutils.spawn

Provides the 'spawn()' function, a front-end to various platform-
specific functions for launching another program in a sub-process.
Also provides the 'find_executable()' to search the path for a given
executable name.
"""
import sys, os
from distutils.errors import DistutilsPlatformError, DistutilsExecError
from distutils.debug import DEBUG
from distutils import log


def spawn(cmd, search_path=1, verbose=0, dry_run=0):
    """Run another program, specified as a command list 'cmd', in a new process.
    
    'cmd' is just the argument list for the new process, ie.
    cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
    There is no way to run a program with a name different from that of its
    executable.
    
    If 'search_path' is true (the default), the system's executable
    search path will be used to find the program; otherwise, cmd[0]
    must be the exact path to the executable.  If 'dry_run' is true,
    the command will not actually be run.
    
    Raise DistutilsExecError if running the program fails in any way; just
    return on success.
    """
    cmd = list(cmd)
    if os.name == "posix":
        _spawn_posix(cmd, search_path, dry_run=dry_run)
    else:
        if os.name == "nt":
            _spawn_nt(cmd, search_path, dry_run=dry_run)
        else:
            raise DistutilsPlatformError(
                "don't know how to spawn programs on platform '%s'" % os.name
            )


def _nt_quote_args(args):
    """Quote command-line arguments for DOS/Windows conventions.
    
    Just wraps every argument which contains blanks in double quotes, and
    returns a new argument list.
    """
    for i, arg in enumerate(args):
        if " " in arg:
            args[i] = '"%s"' % arg

    return args


def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
    executable = cmd[0]
    cmd = _nt_quote_args(cmd)
    if search_path:
        executable = find_executable(executable) or executable
    log.info((" ").join([executable] + cmd[1:]))
    if not dry_run:
        try:
            rc = os.spawnv(os.P_WAIT, executable, cmd)
        except OSError as exc:
            if not DEBUG:
                cmd = executable
            raise DistutilsExecError("command %r failed: %s" % (cmd, exc.args[-1]))

        if rc != 0:
            if not DEBUG:
                cmd = executable
            raise DistutilsExecError(
                "command %r failed with exit status %d" % (cmd, rc)
            )


if sys.platform == "darwin":
    from distutils import sysconfig

    _cfg_target = None
    _cfg_target_split = None


def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
    global _cfg_target
    global _cfg_target_split
    log.info((" ").join(cmd))
    if dry_run:
        return
    executable = cmd[0]
    exec_fn = search_path and os.execvp or os.execv
    env = None
    if sys.platform == "darwin":
        if _cfg_target is None:
            _cfg_target = sysconfig.get_config_var("MACOSX_DEPLOYMENT_TARGET") or ""
            if _cfg_target:
                _cfg_target_split = [int(x) for x in _cfg_target.split(".")]
        if _cfg_target:
            cur_target = os.environ.get("MACOSX_DEPLOYMENT_TARGET", _cfg_target)
            if _cfg_target_split > [int(x) for x in cur_target.split(".")]:
                my_msg = (
                    '$MACOSX_DEPLOYMENT_TARGET mismatch: now "%s" but "%s" during configure'
                    % (cur_target, _cfg_target)
                )
                raise DistutilsPlatformError(my_msg)
            env = dict(os.environ, MACOSX_DEPLOYMENT_TARGET=cur_target)
            exec_fn = search_path and os.execvpe or os.execve
    pid = os.fork()
    if pid == 0:
        try:
            if env is None:
                exec_fn(executable, cmd)
            else:
                exec_fn(executable, cmd, env)
        except OSError as e:
            if not DEBUG:
                cmd = executable
            sys.stderr.write("unable to execute %r: %s\n" % (cmd, e.strerror))
            os._exit(1)

        if not DEBUG:
            cmd = executable
        sys.stderr.write("unable to execute %r for unknown reasons" % cmd)
        os._exit(1)
    else:
        while 1:
            try:
                pid, status = os.waitpid(pid, 0)
            except OSError as exc:
                if not DEBUG:
                    cmd = executable
                raise DistutilsExecError("command %r failed: %s" % (cmd, exc.args[-1]))

            if os.WIFSIGNALED(status):
                if not DEBUG:
                    cmd = executable
                raise DistutilsExecError(
                    "command %r terminated by signal %d" % (cmd, os.WTERMSIG(status))
                )
            else:
                if os.WIFEXITED(status):
                    exit_status = os.WEXITSTATUS(status)
                    if exit_status == 0:
                        return
                    if not DEBUG:
                        cmd = executable
                    raise DistutilsExecError(
                        "command %r failed with exit status %d" % (cmd, exit_status)
                    )
                else:
                    if os.WIFSTOPPED(status):
                        continue
                    else:
                        if not DEBUG:
                            cmd = executable
                        raise DistutilsExecError(
                            "unknown error executing %r: termination status %d"
                            % (cmd, status)
                        )


def find_executable(executable, path=None):
    """Tries to find 'executable' in the directories listed in 'path'.
    
    A string listing directories separated by 'os.pathsep'; defaults to
    os.environ['PATH'].  Returns the complete filename or None if not found.
    """
    if path is None:
        path = os.environ["PATH"]
    paths = path.split(os.pathsep)
    base, ext = os.path.splitext(executable)
    if sys.platform == "win32":
        if ext != ".exe":
            executable = executable + ".exe"
    if not os.path.isfile(executable):
        for p in paths:
            f = os.path.join(p, executable)
            if os.path.isfile(f):
                return f

        return
    else:
        return executable
